Administrator Guide

INTERFACE mode
ip address ip-address mask [secondary]
• ip-address mask: enter an address in dotted-decimal format (A.B.C.D). The mask must be in slash
format (/24).
• secondary: the IP address is the interface’s backup IP address. You can configure up to eight
secondary IP addresses.
Deleting or Disabling a Port Channel
To delete or disable a port channel, use the following commands.
• Delete a port channel.
CONFIGURATION mode
no interface portchannel channel-number
• Disable a port channel.
shutdown
When you disable a port channel, all interfaces within the port channel are operationally down also.
Load Balancing through Port Channels
Dell Networking OS uses hash algorithms for distributing traffic evenly over channel members in a port
channel (LAG). The hash algorithm distributes traffic among ECMP paths and LAG members. The distribution
is based on a flow, except for packet-based hashing. A flow is identified by the hash and is assigned to one
link. In packet-based hashing, a single flow can be distributed on the LAG and uses one link.
Packet based hashing is used to load-balance traffic across a port-channel based on the IP Identifier field
within the packet. Load balancing uses source and destination packet information to get the greatest
advantage of resources by distributing traffic over multiple paths when transferring data to a destination.
Dell Networking OS allows you to modify the hashing algorithms used for flows and for fragments. The load-
balance and hash-algorithm commands are available for modifying the distribution algorithms. Their syntax
and implementation are somewhat different between the E-Series and the C-Series and S-Series
NOTE
: Hash-based load-balancing on MPLS does not work when packet-based hashing (load-balance
ip-selection packet-based) is enabled.
Changing the Hash Algorithm
The load-balance command selects the hash criteria applied to port channels.
If you do not obtain even distribution with the load-balance command, you can use the hash-algorithm
command to select the hash scheme for LAG, ECMP and NH-ECMP. You can rotate or shift the 12–bit Lag
Hash until the desired hash is achieved.
To change to another algorithm, use the second command.
Interfaces 425